Polyculture requirements:
The requirements of polyculture for ponds: the ponds should have good water intake and drainage facilities, and the ponds should be surrounded by nylon nets and other materials, with escape prevention facilities 50 cm high. Aquatic plants such as Sophora alopecuroides or black algae should be planted around the pond, covering one third of the water surface of the pond to facilitate the growth of crayfish and crabs. The newly-built pond is cleaned with quicklime mixed with water, and the dosage is per mu150kg; Firstly, the old pond is dredged, trimmed and exposed to the sun, and each mu of dry pond is disinfected with 50 kilograms of quicklime; At the same time, completely eliminate wild enemies such as catfish, frogs, snakeheads, snakes and mice in the pond. Before the pond enters the water, a filter should be installed to prevent the enemy from entering the water. The depth of the pool water is maintained at 50-80 cm, and the transparency is 35-40 cm. It is best to raise 250 kilograms of snails per mu before and after Qingming.
Crawfish:
Crayfish (scientific name: Procambarus clarkii): also known as Procambarus clarkii, red crayfish and freshwater crayfish. Shaped like a shrimp with a hard shell The adult is about 5.6~ 1 1.9 cm long, dark red, with nearly black carapace and wedge-shaped stripes on the ventral back. Young shrimps are evenly gray, sometimes with black ripples. Long and narrow claws. The middle part of the carapace is not separated by a mesh gap, and there are obvious particles on the carapace. The frontal sword has a lateral thorn or a notch at the end of the frontal sword. Because of its omnivorousness, fast growth and strong adaptability, it has formed an absolute competitive advantage in the local ecological environment. Its feeding range includes aquatic plants, algae, aquatic insects and animal carcasses. When food is scarce, they also kill each other.
Hairy crabs:
Is Eriocheir sinensis economical? Crab, also called crab? River crab? Hairy crabs, clear water crabs, hairy crabs. It is a famous food in China. Its claws are used for foraging and resisting enemies, and the inside and outside edges of the palm are densely covered with fluff, hence the name Eriocheir sinensis. ? Omnivorous animals, such as fish, shrimp, snails, mussels, worms, earthworms, insects and their larvae, can all be used as animal feed for hairy crabs.
Crabs contain more vitamin A, which is helpful for skin keratinization. It can also supplement calcium for rickets in children and osteoporosis in the elderly. Lakes are widely distributed in the north and south coastal areas of China, among which the Yangtze River system has the largest output and extremely delicious taste. Which one is it? Gucheng Lake hairy crabs are the most famous, and have always been called the crown of crabs, and have been recognized by the State Administration for Industry and Commerce as? China famous trademark. What are other famous trademarks? Taihu hairy crabs? Yangcheng Lake hairy crabs? Changdanghu hairy crabs, etc